Richard Thomas, the son of retired Welsh farmer Llywelyn Thomas, says he was beaten to death by two burglars despite presenting no threat to them at all.
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There will be a fresher feel with temperatures falling lower than on recent nights.
The accident between junction 24, Coldra, and 23A, Magor, has closed the eastbound carriageway.
Eloise Parry, 21, died after taking diet pills containing the poisonous Dinitrophenol (DNP).